Hi Guy, thank you. Yes, I've got the Mk.2 Aircrew Manual from Peter, and I've read the part about the Director Horizon a ton of times... still don't understand it. It's the kind of thing that one needs to see work in person. And, I've been in good contact with the folks who built the Vulcan sim in the UK -- great people! There seems to be some questions about its functioning, even on their part. I simply saw this thread, and I figured I'd ask around.
I'll check with the RAF museums and see if they have any old training materials on it. Thanks!
BTW, I helped dismantle Comet 4C N999WA (formerly XA-NAS) at KORD in the early 1980s and 1990s as a teenager... I still look at those photos wishing I could go back in time. The City Of Chicago destroyed the airplane, despite our plans to salvage it for the Smithsonian.